{"product_id":"siemens-6es7421-1fh20-0aa0-industrial-automation-module-stable","title":"Siemens 6ES7421-1FH20-0AA0 Industrial Automation Module - Stable","description":"\u003ch2\u003eProduct Introduction\u003c\/h2\u003e\u003cp\u003eWith 16 isolated digital inputs and a wide input voltage range of 120\/230 V UC, the \u003cstrong\u003eSiemens 6ES7421-1FH20-0AA0\u003c\/strong\u003e delivers robust performance for demanding industrial automation environments. This SIMATIC S7-400 SM 421 module conforms to IEC 61131 Type 2, making it ideal for direct connection to AC\/DC sensors. Its low power loss of 12 W typ. reduces heat generation and operational costs.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications Breakdown\u003c\/h2\u003e\u003cp\u003eKey parameters of the \u003cstrong\u003eSiemens 6ES7421-1FH20-0AA0\u003c\/strong\u003e include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e16 digital inputs, isolated in groups of 4\u003c\/li\u003e\n\u003cli\u003eInput voltage: 120\/230 V UC (47–63 Hz); signal \"0\" 0–40 V AC \/ -40 to +40 V DC; signal \"1\" 74–264 V AC \/ 80–264 V DC\u003c\/li\u003e\n\u003cli\u003eInput current for signal \"1\" typ. 10 mA at 120 V (AC) and 1.8 mA (DC)\u003c\/li\u003e\n\u003cli\u003eInput delay max. 20 ms (0→1) and 30 ms (1→0) for AC\u003c\/li\u003e\n\u003cli\u003ePower loss typ. 12 W\u003c\/li\u003e\n\u003cli\u003eDiagnostics function: No\u003c\/li\u003e\n\u003cli\u003eIsolation tested with 1500 V AC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eSiemens 6ES7421-1FH20-0AA0\u003c\/strong\u003e excels in applications requiring high-voltage AC sensing, such as power distribution monitoring, motor control centers, and conveyor systems. Its ability to handle both AC and DC inputs simplifies wiring in mixed-signal environments. For example, in a packaging plant, this module can directly interface with 120 V AC proximity sensors without external converters, reducing component count and system complexity.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eMount the \u003cstrong\u003eSiemens 6ES7421-1FH20-0AA0\u003c\/strong\u003e on a standard S7-400 rack. Connect via the backplane bus; the module draws a maximum of 80 mA from the 5 V DC bus. Ensure shielded cables (max. 1000 m) for noise-sensitive environments, or unshielded (max. 600 m) for general use. Each input group of four channels is isolated, allowing mixing of different voltage sources within the same module.\u003c\/p\u003e\u003ch2\u003eSelection Guide \u0026amp; Purchasing Advice\u003c\/h2\u003e\u003cp\u003eWhen selecting the \u003cstrong\u003eSiemens 6ES7421-1FH20-0AA0\u003c\/strong\u003e, verify compatibility with your S7-400 CPU and backplane version. Confirm that the input voltage range matches your field devices. For reliable supply, consider purchasing from \u003cstrong\u003ePLC Source PRO\u003c\/strong\u003e (available through ubest101.myshopify.com) to ensure genuine Siemens parts and prompt delivery.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default","offer_id":44410522304611,"sku":"6ES7421-1FH20-0AA0","price":280.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/6ES7421-1FH20-0AA0.jpg?v=1785181907","url":"https:\/\/www.plcsourcepro.com\/products\/siemens-6es7421-1fh20-0aa0-industrial-automation-module-stable","provider":"PLC Source PRO","version":"1.0","type":"link"}